Lead Sheathed Cables/ Current Ratings/Installation Conditions

Installation Conditions
1. Continuous operating temperature of conductor
a) PVC type-5 insulated	85° C
b) XLPE insulated	90° C
2. Ambient temperature	52° C
3. Temperature of ground	35° C
4. Depth of laying in ground
a) LV Cables	750 mm
b) MV Cables	1000 mm
5. Thermal resistivity of soil	1.2° C .m/W

OTHER CONDITIONS
A. LOW VOLTAGE CABLES 600/1000V
1. SINGLE CORE CABLES
i) Two cables spaced one cable diameter installed vertical in air.
ii) Two cables spaced one cable diameter laid horizontally underground.
2. MULTI CORE CABLES
i) Single cable touching wall installed in air.
ii) Single isolated buried cable in ground.
iii) Single cable installed in single isolated buried ducts -
a) Duct Material	Earthen Ware
b) Depth of laying	i) LV Cables : 750 mm ii) MV Cables : 1000 mm
c) Duct diameter
i) Cable dia. up to 65 mm	OD = 130mm & ID = 100 mm
ii) Cable dia. above 65 mm	OD = 160 mm & ID = 125mm

B. MEDIUM VOLTAGE CABLES 6.6 KV TO 33 KV
1. SINGLE CORE CABLES
i) Three Cables, trefoil, in air, two point bonding, separated from wall.
ii) Three Cables flat with a gap of one cable diameter installed vertically in air, separated from wall. Single point or cross blonded.
iii) Three Cables with gap one cable diamenter laid horizontally underground
2. MULTI CORE CABLES
i) Single cable touching wall installed in air.
ii) Single isolated buried cable in ground.

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